Enhancing Electrochemical Performance of Graphene Fiber-Based Supercapacitors by Plasma Treatment

• DOI: 10.1021/acsami.8b04438
• Publication Date: 2018-03-30T19:02:48Z
• Authors: Jie Meng; Wenqi Nie; Kun Zhang; Fujun Xu; Xin Ding; Shiren Wang; Yiping Qiu
• Keywords: 02 engineering and technology; 0210 nano-technology; 7. Clean energy

Graphene fiber-based supercapacitors (GFSCs) hold high power density, fast charge–discharge rate, ultralong cycling life, exceptional mechanical/electrical properties, and safe operation conditions, making them very promising to small wearable electronics. However, the electrochemical performance is still limited by severe stacking of graphene sheets, hydrophobicity fibers, complex preparation process. In this work, we develop a facile but robust strategy easily enhance properties all-solid-state GFSCs simple plasma treatment. We find that 1 min treatment under an ambient condition results in 33.1% enhancement areal specific capacitance (36.25 mF/cm2) comparison as-prepared GFSC. The energy density reaches 0.80 μW h/cm2 polyvinyl alcohol/H2SO4 gel electrolyte 18.12 poly(vinylidene difluoride)/ethyl-3-methylimidazolium tetrafluoroborate electrolyte, which are 22 times ones. plasma-treated also exhibit ultrahigh rate capability (69.13% for 40 s ones) superior cycle stability (96.14% retention after 20 000 cycles ones). This can be extended mass-manufacture high-performance carbonaceous supercapacitors, such as carbon nanotube-based